Every client-review tool prices by seat. Frame.io Pro is $15 per member per month, and Team is $25. The logic is familiar: more people, more value, more money. It works well for the vendor.
It works badly for a studio. The producer who opens the tool twice a month costs the same as the editor living in it. The freelancer you bring on for three weeks costs a full month. And the client, the person the whole thing exists for, either costs you a seat or gets a degraded experience.
The costs of running this product do not look like that at all. Our bill has two lines: bytes held on disk, and bytes sent to somebody looking at them. Neither has anything to do with how many people are named on an account.
So we price the way the cost behaves. $39 buys the software outright. After that you pay for storage and delivery per gigabyte, out of a balance you top up in advance. Reviewers are free and unlimited, because a reviewer costs us nothing until they actually open something.
The honest part: this is not cheaper for everyone. Usage pricing beats seat pricing until your archive gets big enough, and then it stops. On the pricing page the calculator tells you where your own crossover is. For most people it is a long way off. For a studio keeping every 4K master online forever, it is not.